Abstract:From the position of the empirical skepticism,Hume put the problem of necessity of the causality in general into the problem of necessity of the causality in particular and he made a conclusion that the necessity of causality is just the habitual association of mind.From the point of the rationalism,Kant converts the problem to whether we can think of the causality in priori.We can make a conclusion that he cannot solve this problem,but he converts the standpoint of this problem,and gives it an interpretation deeply.